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EASA issues emergency AD to prevent fire risk on Airbus A350 aircraft
24 August 2017

The European Aviation Safety Agency (EASA) issued an ermergency airworthiness directive (AD) to prevent a fire risk on Airbus A350 aircraft.

The AD states that, “In the A350 design, the hydraulic fluid cooling system is located in the fuel tanks. Recently, an overheat failure mode of the the A350 hydraulic Engine Driven Pump (EDP) has been found. Such EDP failure may cause a fast temperature rise of the hydraulic fluid. This condition, if not detected and corrected, combined with an inoperative Fuel Tank Inerting System (FTIS), could lead to an uncontrolled overheat of the hydraulic fluid, possibly resulting in ignition of the fuel-air mixture in the affected fuel tank.
To address this potential unsafe condition, Airbus issued a Major Event Revision of the Airbus A350 Master Minimum Equipment List (MMEL) that incorporates restrictions to avoid an uncontrolled overheat of the hydraulic system.”

This AD is considered as an interim action and further AD action may follow.

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